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https://github.com/envmodules/modules.git
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e816ab15b5
fly, as it were. It's a powerful mechanism for dynamically changing environment variables, aliases, X11 resources, etc. It uses an embedded Tcl intrepretor, with a few extensions. Therefore, it has a well defined language syntax. Version 3.1 is GPL, and includes many improvements over the 3.0beta.
267 lines
7.9 KiB
C
267 lines
7.9 KiB
C
/*****
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** ** Module Header ******************************************************* **
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** **
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** Modules Revision 3.0 **
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** Providing a flexible user environment **
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** **
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** File: ModuleCmd_Load.c **
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** First Edition: 91/10/23 **
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** **
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** Authors: John Furlan, jlf@behere.com **
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** Jens Hamisch, jens@Strawberry.COM **
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** **
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** Description: The load and unload procedure that takes care of **
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** adding and removing modulefiles to and from the **
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** user's environment. **
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** **
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** Exports: ModuleCmd_Load **
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** **
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** Notes: **
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** **
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** ************************************************************************ **
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****/
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/** ** Copyright *********************************************************** **
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** **
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** Copyright 1991-1994 by John L. Furlan. **
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** see LICENSE.GPL, which must be provided, for details **
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** **
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** ************************************************************************ **/
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static char Id[] = "@(#)$Id: ModuleCmd_Load.c,v 1.1 2000/06/28 00:17:32 rk Exp $";
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static void *UseId[] = { &UseId, Id };
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/** ************************************************************************ **/
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/** HEADERS **/
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/** ************************************************************************ **/
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#include "modules_def.h"
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/** ************************************************************************ **/
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/** LOCAL DATATYPES **/
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/** ************************************************************************ **/
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/** not applicable **/
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/** ************************************************************************ **/
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/** CONSTANTS **/
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/** ************************************************************************ **/
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/** not applicable **/
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/** ************************************************************************ **/
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/** MACROS **/
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/** ************************************************************************ **/
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/** not applicable **/
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/** ************************************************************************ **/
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/** LOCAL DATA **/
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/** ************************************************************************ **/
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static char module_name[] = "ModuleCmd_Load.c"; /** File name of this module **/
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#if WITH_DEBUGGING_MODULECMD
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static char _proc_ModuleCmd_Load[] = "ModuleCmd_Load";
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#endif
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/** ************************************************************************ **/
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/** PROTOTYPES **/
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/** ************************************************************************ **/
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/** not applicable **/
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/*++++
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** ** Function-Header ***************************************************** **
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** **
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** Function: ModuleCmd_Load **
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** **
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** Description: Execution of the module-commands 'load' and 'unload' **
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** **
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** First Edition: 91/10/23 **
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** **
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** Parameters: Tcl_Interp *interp Attached Tcl Interp. **
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** int load Controls 'load' or **
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** 'unload' to be done **
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** int argc Number of arguments **
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** char *argv[] Argument list **
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** **
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** Result: int 0 None of the passed modules **
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** has been load **
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** 1 At least one module has been **
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** read **
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** **
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** Attached Globals: specified_module The module name from the **
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** command line **
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** **
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** ************************************************************************ **
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++++*/
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int ModuleCmd_Load( Tcl_Interp *interp,
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int load,
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int argc,
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char *argv[])
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{
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int i,
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return_val, /** Subroutine return values **/
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a_successful_load = 0; /** Command return **/
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char filename[ MOD_BUFSIZE], /** Module filename **/
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modulename[ MOD_BUFSIZE]; /** Real module name **/
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Tcl_Interp *tmp_interp; /** Tcl interpreter to be **/
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/** used internally **/
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Tcl_HashTable **oldTables = NULL;
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#if WITH_DEBUGGING_MODULECMD
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ErrorLogger( NO_ERR_START, LOC, _proc_ModuleCmd_Load, NULL);
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#endif
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/**
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** Set up the flags controling the Tcl callback functions
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**/
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if( load)
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flags |= M_LOAD;
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else
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flags |= M_REMOVE;
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/**
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** Handle all module files in the order they are passed to me
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**/
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for( i=0; i<argc && argv[i]; i++) {
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/**
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** Set the name of the module specified on the command line
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**/
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specified_module = argv[i];
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/**
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** Create a Tcl interpreter and initialize it with the module commands
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**/
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tmp_interp = Tcl_CreateInterp();
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if( TCL_OK != (return_val = InitializeModuleCommands( tmp_interp)))
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return( return_val); /** -------- EXIT (FAILURE) -------> **/
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filename[0] = '\0';
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/**
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** UNLOAD to be done
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** At first check if it is loaded ...
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**/
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if( !load) {
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char *tmpname;
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if( !IsLoaded( tmp_interp, argv[i], &tmpname, filename)) {
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#if 1
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/** do we really care if it's not loaded ... **/
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if( OK != ErrorLogger( ERR_NOTLOADED, LOC, argv[i], NULL))
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#endif
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return_val = TCL_ERROR;
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} else {
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/**
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** So it is loaded ...
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** Do we know the filename?
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**/
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strcpy( modulename, tmpname);
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if( !filename[0])
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if( TCL_ERROR == (return_val = Locate_ModuleFile(
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tmp_interp, argv[i], tmpname, filename)))
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ErrorLogger( ERR_LOCATE, LOC, argv[i], NULL);
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/**
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** If IsLoaded() created tmpname, then we must free it.
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**/
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if( tmpname && tmpname != argv[i])
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free( tmpname);
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} /** if loaded **/
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/**
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** LOAD to be done
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** Only check the filename
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**/
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} else {
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if( TCL_ERROR == (return_val = Locate_ModuleFile( tmp_interp,
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argv[i], modulename, filename)))
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ErrorLogger( ERR_LOCATE, LOC, argv[i], NULL);
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}
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/**
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** If return_val has been set to something other than TCL_OK,
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** then read_status should not be set -- by the ANSI definition.
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**
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** The functions Read_Modulefile and Update_LoadedList will take
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** respect to the 'flags' which are set to M_LOAD or M_REMOVE
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** according to the intention of calling this procedure.
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**/
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current_module = modulename;
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if( TCL_OK == return_val &&
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0 == Read_Modulefile( tmp_interp, filename)) {
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Update_LoadedList( tmp_interp, modulename, filename);
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/**
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** Save the current environment setup before the next module
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** file is (un)loaded in case something is broken ...
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** ... for Unwind_Modulefile_Changes later on
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**/
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if( oldTables) {
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Delete_Hash_Tables( oldTables);
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free((char*) oldTables);
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}
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oldTables = Copy_Hash_Tables();
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a_successful_load = 1;
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} else {
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/**
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** Reset what has been changed.
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**/
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Unwind_Modulefile_Changes( tmp_interp, oldTables);
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oldTables = NULL;
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return_val = TCL_ERROR;
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}
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Tcl_DeleteInterp(tmp_interp);
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} /** for **/
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/**
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** There may only be a spare save environment left, if the final module
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** has been load successfully. Remove it in this case
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**/
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if( return_val == TCL_OK && oldTables) {
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Delete_Hash_Tables( oldTables);
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free((char*) oldTables);
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}
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/**
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** Clean up the flags and return
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**/
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if( load)
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flags &= ~M_LOAD;
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else
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flags &= ~M_REMOVE;
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#if WITH_DEBUGGING_MODULECMD
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ErrorLogger( NO_ERR_END, LOC, _proc_ModuleCmd_Load, NULL);
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#endif
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return( a_successful_load);
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} /** End of 'ModuleCmd_Load' **/
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